Sewing-machine



(ModeL) 2 Sheets-Sheet 1. W. J. STEWART.

SEWING MACHINE.

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(ModeL) 2 SheetsSheet 2.

- W. J. STEWART.

I SEWING MACHINE. v N0. 330,272. Patented NOV. 10,1885

]4 GJJEJ I I 79 3 fr %d g d v'ZZiam ffiawri Wm ,3, @A WAUQ NrTnD STA Arnnrr rrrcng i" \VILLIAM J. STEXVABT, OF BELLEVILLEILLINOIS,

SEWING-MACHINE.

BPECIFJICATIQKT forming part of Letters Patent ED330372, dated November 10, 1885.

Application filed July 14, 1884.

To all whom it may concern: i

Be it known that I, WILLIAM J. STEWART, a citizen of the United States, and residing at Belleville, in the county of St. Clair and State ofIll inois, have invented a certain new and useful Improvement in Sewing-Machines, which is fully set forth in the following specification, reference being had to the accompanying drawings, in which- Figure 1 represents a side elevation of a machine embodying my invention, a part of the standard being broken away; Fig. 2, a plan section ofthe same,taken on the line a: :20 ofFig. 1; Fig. 3, a vertical section of the same,taken on the line y y, Fig. 1. Fig. 4 is a detail view showing the lever which operates the shuttle lever. Fig. 5 is an elevation of the pitmanlever and its guide detached, and on an enlarged scale; Fig. 6, a sectional view of the up per portion of the same on the line 22 c of Fig. 5; Fig. 7, an elevation of the vibrating lever which operates the shuttle -lever detached, and Fig. 8 a sectional view on the line 2 zof Fig. 7.

My invention relates to the'mechanism for operating the feed devices ofa sewing-machine, and is in the nature of an improvement upon my previous application,No. 181, 251, filed May 12, 1884.

I will proceed to describe in detail the construction and operation of a machine embodying my invention in one practical form, and will then specifically point out in the claims the features I believe to be new and wish to protect by Letters Patent.

As my present invention relates only to a part of the machine, I shall particularly de scribe only such portions of the entire machine as are necessary to a full understanding of the construction of my improvement.

In the drawings, A represents the bed-plate of the sewing-machine, and B the standarcl,in which the main shaft 0 is mounted in the usual way. On the main shaft is a crank, c, to which the upper end of the feed-shaft pitmau D is connected. The feed-shaft E is mounted in any ordinary way on the under side of the plate, and the shuttle-leverF is also mounted on the same side of the bed-plate, being pivoted so as to vibrate as required. The lower end of the pitman D is connected to the crank c on the end of the feed-shaft in the usual man- Scrial No. 137,712. (ModeL) the lever G is attached, by screws hor other suitable'means, a guide, H, through which the pitrnan D reciprocates, thus forming'a support for said pitman inter-mediate between the. cranks c and c. This guide is preferably split and provided with clamp-screws h, by which the parts can be brought closer together to take up wear. The guide His preferably adj ustably connected to the lever G, this adjustable con--. nection being shown as effected, in the present instance, by means of slots 9 formed in the bed i or seat Gr upon which the guide is attached,the .75 screws h passing through these slots and allowing the guide to be adjusted in such a position relatively to the trunnions gand main and feed shafts as to prevent any binding of the pitman 1 D in the guide. By the use of this guide, attached as described, all lateral supports on the I crank c are dispened with, and the strain on the parts at a high rate of speed is more equally distributed. This construction is more especially adapted and intended for use in machines run by power at a high rate of speed-as in shops, Ste-in contradistinction to the ordinary foot-power, the construction described in my previous application not being well adapted to high speed in operation.

In practice it is found that even after the most careful finishing of the parts, upon assembling the same they are liable to be slightly out of true, and consequently the up per portions of the pitman D and lever G,wl 1ere they are in contact with the main shaft G, do

- not have their bearing-surfaces in exact parrelation thereto. This result is effected in the case of the pitman D by screw-threading the upper end of the body thereof at d and forming the head D, which carries the bearing embracing the crank c, with a screwthreaded recess, 03, adapted to receive the screw-threaded end of the body D. A setscrew, d, in the head D serves to connect the two parts rigidly after adjustment. In the case of the vibrating lever G the upper end or head, G, is formed with a stem or shank, extending down into a correspondingsocket, G formed in the upper end of the body of the lever,to receive the same, and aset-screw, is. employed to make rigid the connection between the two after adjustment. After the parts have been assembled the shaft 0 is rotated slowly before the screws h (Z and 9 have been tightened up, whereupon the guide H and the heads D and G will assume their proper position relatively to the other parts, when the several setscrews may be tightened to clamp them in place.

The trunnions g are preferably constructed as shown, consisting of short cylindrical pieces, the outer ends of which are mounted in suitable hearings in the casing B, while the inner described above, and shown in the drawings,

for obviously these may be changed Without departing from the principle of my invention, andthe improvement may be applied to different varieties of sewing-machines.

Having thus described my invention, what I claim as new, and wish to protect by Letters Patent, is

1. In a sewing-machine, the combination,

with the main shaft and feed-shaft and a pitman connecting the two, of a vibrating lever mounted on trnnnions arranged below the main shaft,

the pitman reciprocates, substantially as and for the purposes specified.

2. In a sewing-machine, the combination,

with the pitman which operates the feed-shaft,

of an independently-operated vibrating lever,

. operating the shuttle-lever and having a guide through which the pitman reciprocates, the axis of vibration of the said lever being at right angles to the axis of the said guide, substantially as and for the purposes specified.

3. In a sewing-machine, the combination, with the shaft C, having crank c, feed-shaft E, having crank c, and pitman D, connecting the two, of lever G, mounted on an axis parallel with and between the said shafts, its upper end embracing the crank 0, and its lower end connected with and operating the shuttlelever,and the guide H, secured thereon, to receive the pitman D, substantially as and for the purposes specified.

4. The combination,with the main shaft 0, having crank c, of the pitman I) and vibrating lever G, the latter mounted on an axis parallel with the said shaft and being provided with a guide through which the former reciprocates, and both said lever and pitman being provided with axially-adjustable upper ends embracing the said crank, substantially as and for the purposes specified.

5. The combination, with the pitman D, of the independently-actuated vibrating lever G, provided with a guide, H, adjustably mounted thereon, to receive the pitman, substantially as and for the purposes specified.

WM. J. STEWART.

Witnesses:

L. L. GoBURN, A. M. Basin. 

